Improvement in cutter-heads for planing-maohines



NAFETERS, PHOTO-LITHUGRAPHEH. WASHINGTON D idtiit hmitti da,

Letters'latent No. 113,262, dated April 4, 1871.

IMPRQVEMENT IN C-UTTE'R-HEADS FOR PLANINGMAOHINES.

The Schedule referred to in these Letters Patent and maldngparb of the same.

E. Vlltlon'rla, of Hamilton, in Butler county, Ohio,

have invented certain new and useful Improvementsin Panel-raising Heads for Flaming-Machines and we do hereby declare that the following is a full and ex: act description thereof', reference being had to the accompanying drawings'andto' the letters of reference marked thereon. v

Figure 1 represents aside view'of our cutter-head.

Figure, 2 represents an edge view of same.

We denominate this new device a skeleton cutterhead, toV distinguish it from that class of cutter-heads made of circular form, andtvwhich .is provided with radial slots for the insertion-of the bits', and to discharge the chips and shavings.- Y*

The slotted disk-formed cutter-head is objectionable on account lof its size, which 'was a necessity to prevent breaking, as the slots 'extended from the periphery to near its, center.

, The `disk or' central portion ot' our'cutter-head is enlarged, and' may properly be called a hub, which is denoted by letter a.

rllhe four radial arms b bse'rveasseats for the bits c o'.4 i

The narrow bits c are only equal in width to one-A in relation to the face of the cutterhead, and consequently'the bits c will stand ont laterally, (near the periphery of the arms,) beyond -the face A ofthe cutter-head, as seen at x, iig.

The object of this arrangement of the bits c, with 'their outer corners projecting beyondthe face of the cutter-head, is to give clearance in working, which prevents friction.

The-bits c are secured in their seats by means ofthe bolts m, seen in dotted lines in iig. 2, and the nuts n retain the bolts m in'place.

The wide smoothing-bits d are secured upon the angular arms or seats b', without a cap,.by means of a screw and washer e j; and both of the bits are accessible to be sharpened without4 removing them from their seats.

llhe narrow and wide bits'workin the same plane with the faceof the cutter-head.

The narrowv bit c removes thcbnlk of wood,while the broad smoothing-bit c finishes the work.

Heretofore the two bits (or pairs) have been placed upon the same side of a disk, and have been so ar-l ranged that their edges were inaccessible, without removing them, to lbersharpened.

Both of the bits constituted but a single angular bit, as before used, and as the narrow portion, working against the grain of thevwood, would wear out faster' than the' broad smoothing portion, there was a necessity of grinding down the edge. 'of the smoothing-bit to cor.- respond in length with the shortened'narnow bit. Besides, the fact that both bits were made in one piece of metal, and located at the same point upon the cutter-head; greatly weakened the latter.

The form of our cutter-head enables the attendant to readily adjust the bits for all-kinds of work for which they are designed. The circular panelr'aising headsv would not admit lof measurement between the bits, as may be done in the using of our improvement; but in theusev of the others trials had to be made to ascertain the proper adjustment for tenons of dierent lengths.

It has been remarked that the slot in which the narrow bit c is inserted is increased in depth from the periphery (or point of the bit) to the rear'or heel o' the slot, and it is also formed at an angle to the face of the cutter-head, so as to give clearance, and also lcause the bit to make a shearing cut.

By experiments and trials we `have proved that this form of' cutter-head is superior to others, because it is capable of resisting greater strain', is of smaller dimensions, is cheaply fitted up for use, it a'ords free discharge of chips, Ais accessible to measure .and adjust;l

the bits, and the bits may be sharpened without re moving them fromtheir seats. y

-Our improved cutter-head may be safely used, and may be relied upon for accuracy of operation i Having fully described our improvement in cutter'- heads for planing-machines,

What we claim, and desire to secure by Letters' Patent, is-

' -The cutter-head provided with arms b bf and bits c c', constructed and arranged in relation to'each other in the manner substantially as and for the purpose de scribed.

In testimony whereof we have hereunto set our hands this day of June, 1869.

HENRY GLIMER. CHARLES E. MCBETH.

Witnesses:

HENRY HonNn, H, A. EDWARDS. 

